A senior adviser to Iran’s Supreme Leader has fiercely denounced Yukiya Amano – the head of the UN’s nuclear monitoring body, the International Atomic Energy Agency (IAEA) – for his assertion that IAEA inspectors are entitled to access all “relevant locations,” including military sites, inside Iran.

“The claim of such a right is fabricated by Mr. Amano,” Ali Akbar Velayati – a former Iranian foreign minister who now advises Supreme Leader Ayatollah Ali Khamenei on international affairs – told the regime’s official news agency, IRNA, on Tuesday. “If he was independent, and his decisions were based fully on independence, he would have pressed inspecting the nuclear centers of the Zionist regime, because nuclear arms in the occupied lands set as the biggest danger to the entire Middle East region.”

Velayati’s attack on Amano is notable in that it comes two days after the IAEA chief confirmed that Iran, in the view of the agency, is abiding by the terms of the Joint Comprehensive Plan of Action (JCPOA) – the official name of the nuclear deal between Tehran and six world powers, led by the United States, in July 2015.

“The nuclear-related commitments undertaken by Iran under the deal are being implemented,” Amano told the quarterly meeting of the IAEA’s 35-member Board of Governors in Vienna. Amano also told the meeting that Iran had agreed to a “high number” of short-notice inspections of its nuclear sites, without specifically addressing the concern voiced last month by Nikki Haley, the US Ambassador to the UN, that the IAEA does not have enough access in Iran.

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At the same time, Amano did not back down on his statement of September 1, delivered in an interview with the Associated Press, that under the provisions of the JCPOA, the IAEA “has access to all locations without making distinctions between military and civilian locations.” In private briefings with journalists, however, IAEA officials have said they are not seeking to inspect Iranian military sites, as they have no evidence to suspect Iran of carrying out banned activities; critics of the JCPOA have depicted such statements as a face-saving device, countering that the IAEA wants to avoid a losing confrontation with Iran, which has made clear that its military sites are off-limits.

In his statement on Tuesday, Velayati bluntly confirmed this position. “Neither Mr. Amano, his officers nor any other foreigner is entitled to visit our military centers, because the centers are fully secret security zones for any foreigner and foreign affiliates,” IRNA quoted him as saying.

Velayati’s comments come amid persistent rumors that US President Donald Trump’s Administration is looking to ratchet up pressure on Tehran over its ballistic missile tests and its sponsorship of Shia Islamist organizations like Hezbollah in Lebanon. According to a Reuters news agency report on Tuesday, Trump was presented last Friday with a plan assembled by Defense Secretary James Mattis, Secretary of State Rex Tillerson, national security adviser H.R. McMaster, and other top officials. The plan “could allow more aggressive U.S. responses to Iran’s forces, its Shi‘ite Muslim proxies in Iraq and Syria, and its support for militant groups,” the report said.

Also in question is whether Trump will re-certify the JCPOA in October, as the president is legally required to do every 100 days. While Trump has made no secret of his distaste for the deal, the Iran strategy presented to him on Friday by his advisers reportedly does not advocate a withdrawal from the JCPOA, but rather increased economic sanctions and limited military moves to counter Iran’s growing influence.